CVE-2026-55088 (GCVE-0-2026-55088)
Vulnerability from cvelistv5
Published
2026-08-19 19:30
Modified
2026-08-21 21:48
Severity ?
VLAI Severity ?
EPSS score ?
CWE
Summary
Etherpad is a real-time collaborative editor. From 2.6.0 until 3.1.0, Etherpad's src/node/hooks/express/tokenTransfer.ts uses POST /tokenTransfer to store an author token for transfer between browsers and exposes it through GET /tokenTransfer/{uuid}. Although the record includes createdAt, the transfer has no expiration check, is not removed after successful redemption, and is returned by res.send(tokenData), including the raw author token. An unauthenticated attacker who obtains a transfer UUID can repeatedly redeem it, receive fresh author cookies, read the cleartext token, and impersonate the originating author for pad read and write operations. This issue is fixed in version 3.1.0.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-55088",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-21T21:00:33.315866Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-08-21T21:48:47.361Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "etherpad",
"vendor": "ether",
"versions": [
{
"status": "affected",
"version": "\u003e= 2.6.0, \u003c 3.1.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Etherpad is a real-time collaborative editor. From 2.6.0 until 3.1.0, Etherpad\u0027s src/node/hooks/express/tokenTransfer.ts uses POST /tokenTransfer to store an author token for transfer between browsers and exposes it through GET /tokenTransfer/{uuid}. Although the record includes createdAt, the transfer has no expiration check, is not removed after successful redemption, and is returned by res.send(tokenData), including the raw author token. An unauthenticated attacker who obtains a transfer UUID can repeatedly redeem it, receive fresh author cookies, read the cleartext token, and impersonate the originating author for pad read and write operations. This issue is fixed in version 3.1.0."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.8,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-200",
"description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-294",
"description": "CWE-294: Authentication Bypass by Capture-replay",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T19:30:20.288Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/ether/etherpad/security/advisories/GHSA-vqfp-p66c-xrp9",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/ether/etherpad/security/advisories/GHSA-vqfp-p66c-xrp9"
},
{
"name": "https://github.com/ether/etherpad/pull/7784",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/ether/etherpad/pull/7784"
},
{
"name": "https://github.com/ether/etherpad/commit/8c6104c5d5daf41f0d454acc04d42dffa0e0d996",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/ether/etherpad/commit/8c6104c5d5daf41f0d454acc04d42dffa0e0d996"
},
{
"name": "https://github.com/ether/etherpad/tree/3.1.0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/ether/etherpad/tree/3.1.0"
}
],
"source": {
"advisory": "GHSA-vqfp-p66c-xrp9",
"discovery": "UNKNOWN"
},
"title": "Etherpad: Device-to-device author-token transfer endpoint is replayable, never expires, and exposes the cleartext author token"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-55088",
"datePublished": "2026-08-19T19:30:20.288Z",
"dateReserved": "2026-06-16T14:41:54.578Z",
"dateUpdated": "2026-08-21T21:48:47.361Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-55088\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-21T21:00:33.315866Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-08-21T21:00:34.557Z\"}}], \"cna\": {\"title\": \"Etherpad: Device-to-device author-token transfer endpoint is replayable, never expires, and exposes the cleartext author token\", \"source\": {\"advisory\": \"GHSA-vqfp-p66c-xrp9\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 6.8, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"REQUIRED\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}}], \"affected\": [{\"vendor\": \"ether\", \"product\": \"etherpad\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003e= 2.6.0, \u003c 3.1.0\"}]}], \"references\": [{\"url\": \"https://github.com/ether/etherpad/security/advisories/GHSA-vqfp-p66c-xrp9\", \"name\": \"https://github.com/ether/etherpad/security/advisories/GHSA-vqfp-p66c-xrp9\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/ether/etherpad/pull/7784\", \"name\": \"https://github.com/ether/etherpad/pull/7784\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/ether/etherpad/commit/8c6104c5d5daf41f0d454acc04d42dffa0e0d996\", \"name\": \"https://github.com/ether/etherpad/commit/8c6104c5d5daf41f0d454acc04d42dffa0e0d996\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/ether/etherpad/tree/3.1.0\", \"name\": \"https://github.com/ether/etherpad/tree/3.1.0\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Etherpad is a real-time collaborative editor. From 2.6.0 until 3.1.0, Etherpad\u0027s src/node/hooks/express/tokenTransfer.ts uses POST /tokenTransfer to store an author token for transfer between browsers and exposes it through GET /tokenTransfer/{uuid}. Although the record includes createdAt, the transfer has no expiration check, is not removed after successful redemption, and is returned by res.send(tokenData), including the raw author token. An unauthenticated attacker who obtains a transfer UUID can repeatedly redeem it, receive fresh author cookies, read the cleartext token, and impersonate the originating author for pad read and write operations. This issue is fixed in version 3.1.0.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-200\", \"description\": \"CWE-200: Exposure of Sensitive Information to an Unauthorized Actor\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-294\", \"description\": \"CWE-294: Authentication Bypass by Capture-replay\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-08-19T19:30:20.288Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-55088\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-21T21:48:47.361Z\", \"dateReserved\": \"2026-06-16T14:41:54.578Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-08-19T19:30:20.288Z\", \"assignerShortName\": \"GitHub_M\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…