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🛡️ CVE-2023-41335 — fedora

🟢 CVSS 3.7 — Low ✅ No Known Exploit CWE-312 NVD
3.7
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

matrix-synapse vulnerable to temporary storage of plaintext passwords during password changes

Impact

When users update their passwords, the new credentials may be briefly held in the server database. While this doesn't grant the server any added capabilities—it already learns the users' passwords as part of the authentication process—it does disrupt the expectation that passwords won't be stored in the database. As a result, these passwords could inadvertently be captured in database backups for a longer duration.

These temporarily stored passwords are automatically erased after a 48-hour window.

Patches

https://github.com/matrix-org/synapse/pull/16272

References

This bug was due to a regression in https://github.com/matrix-org/synapse/pull/13188.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is high, an attacker needs administrative privileges on the target. A user must be tricked into taking some action. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality low, integrity low, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:N

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: High — the attacker first has to win a race, learn a secret or otherwise prepare the target.
  • Privileges required: High — administrative rights are needed first.
  • User interaction: Required — someone has to click, open or visit something.
  • Scope: Changed — a successful attack reaches components beyond the vulnerable one.
  • Confidentiality impact: Low — limited, and the attacker does not choose what is affected.
  • Integrity impact: Low — limited, and the attacker does not choose what is affected.
  • Availability impact: None.

Weakness class

CVE-2023-41335 is classified as CWE-312: Cleartext Storage of Sensitive Information. Sensitive values are written to storage unencrypted and readable by anyone with access to it.

Affected software

CVE-2023-41335 is recorded against 3 packages.

  • fedora
  • matrix-synapse (from 1.66.0 up to 1.93.0)
  • synapse (from 1.66.0 up to 1.93.0)

Timeline and source

Published on 27 September 2023 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com
github.com
lists.fedoraproject.org
lists.fedoraproject.org
lists.fedoraproject.org
security.gentoo.org
github.com
github.com
lists.fedoraproject.org
lists.fedoraproject.org
lists.fedoraproject.org
security.gentoo.org

Other advisories for this package

fedora has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-312: Cleartext Storage of Sensitive Information) in other software:

CVE-2023-41335 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity LOW
CVSS Score 3.7
CVSS Vector CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:N
CWE CWE-312
Public Exploit ✅ No
Source NVD
Published 2023-09-27
Updated 2026-08-20
Modified 2026-06-17

Affected Packages

Software From version Fixed in
fedora — —
matrix-synapse 1.66.0 1.93.0
synapse 1.66.0 1.93.0

References

Similar Threats

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