Answer in brief
CVE-2023-41335 records a Low severity (CVSS 3.7) vulnerability in matrix-synapse vulnerable to temporary storage of plaintext passwords during password changes. The current sources do not mark it as known exploited. The current feed maps matrix-synapse (pypi). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 3.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps matrix-synapse (pypi). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| matrix-synapsepypi | >=1.66.0 <1.93.0 | 1.93.0 |
Published upstream
Sep 26, 2023
Evidence: source:osv:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:recordFirst seen by HOL
Sep 10, 2026
### 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.
Quoted source text, attributed separately from HOL analysis.