CVE-2025-56761: Memos 0.22 is vulnerable to Stored Cross site scripting (XSS) vulnerabilities by the upload attachment and use

Routine

MEDIUM 5.4DOWNGRADE

CVE-2025-56761 is a medium-severity flaw (CVSS 5.4) affecting memos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Memos 0.22 is vulnerable to Stored Cross site scripting (XSS) vulnerabilities by the upload attachment and user avatar features. Memos does not verify the content type of the uploaded data and serve it back as is. An authenticated attacker can use this to elevate their privileges when the stored XSS is viewed by an admin.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.3% (top 82%)
CISA exploited list	No
Weakness	CWE-79
Published	2025-09-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: usememos

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-09-03 17:15 UTCPublished CVE record published
2026-06-17 09:42 UTCUpdated Record last modified

usememos memos DOWNGRADE

Affected: 0.22.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.22.0

1. Check installed version

apt-cache policy memos || rpm -q memos || memos --version

2. No fixed release: DOWNGRADE to a release before 0.22.0 (Debian / Ubuntu)

apt-cache madison memos sudo apt install memos=<VERSION_BEFORE_0.22.0> sudo apt-mark hold memos

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list memos sudo dnf downgrade memos-<VERSION_BEFORE_0.22.0> sudo dnf versionlock add memos

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-56761?

memos: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-56761 being exploited?

CVE-2025-56761 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-56761 affect?

CVE-2025-56761 affects memos. Severity is medium (CVSS 5.4). Memos 0.22 is vulnerable to Stored Cross site scripting (XSS) vulnerabilities by the upload attachment and user avatar features. Memos does not verify the content type of the uploaded data and serve it back as is. An authenticated attacker

How urgent is CVE-2025-56761?

Priority 28/100. Public exploit reference

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References

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