PYSEC-2026-1611
Vulnerability from pysec - Published: 2026-07-07 14:34 - Updated: 2026-07-07 17:24
VLAI
Details
Impact
Synapse versions before 1.120.1 fail to properly validate invites received over federation. This vulnerability allows a malicious server to send a specially crafted invite that disrupts the invited user's /sync functionality.
Patches
Synapse 1.120.1 rejects such invalid invites received over federation and restores the ability to sync for affected users.
Workarounds
Server administrators can disable federation from untrusted servers.
For more information
If you have any questions or comments about this advisory, please email us at security at element.io.
Severity
Impacted products
| Name | purl | matrix-synapse | pkg:pypi/matrix-synapse |
|---|
Aliases
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "matrix-synapse",
"purl": "pkg:pypi/matrix-synapse"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.120.1"
}
],
"type": "ECOSYSTEM"
}
],
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}
],
"aliases": [
"CVE-2024-52815",
"GHSA-f3r3-h2mq-hx2h"
],
"details": "### Impact\n\nSynapse versions before 1.120.1 fail to properly validate invites received over federation. This vulnerability allows a malicious server to send a specially crafted invite that disrupts the invited user\u0027s `/sync` functionality.\n\n### Patches\n\nSynapse 1.120.1 rejects such invalid invites received over federation and restores the ability to sync for affected users.\n\n### Workarounds\n\nServer administrators can disable federation from untrusted servers.\n\n### For more information\n\nIf you have any questions or comments about this advisory, please email us at [security at element.io](mailto:security@element.io).\n",
"id": "PYSEC-2026-1611",
"modified": "2026-07-07T17:24:38.661129Z",
"published": "2026-07-07T14:34:46.390890Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/element-hq/synapse/security/advisories/GHSA-f3r3-h2mq-hx2h"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-52815"
},
{
"type": "PACKAGE",
"url": "https://github.com/element-hq/synapse"
},
{
"type": "PACKAGE",
"url": "https://pypi.org/project/matrix-synapse"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-f3r3-h2mq-hx2h"
}
],
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Synapse allows a a malformed invite to break the invitee\u0027s `/sync`"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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