CVE-2022-31521: The Niyaz-Mohamed/mosaic repository through 1.0.0 on GitHub allows absolute path traversal because the Flask s

This week

CRITICAL 9.3REMOTEDOWNGRADE

CVE-2022-31521 is a critical-severity flaw (CVSS 9.3) affecting mosaic. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Niyaz-Mohamed/mosaic repository through 1.0.0 on GitHub allows absolute path traversal because the Flask send_file function is used unsafely.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.3 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-22
Published	2022-07-11
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mosaic project

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

Am I affected?

Timeline

2022-07-11 01:15 UTCPublished CVE record published
2026-06-17 04:45 UTCUpdated Record last modified

mosaic project mosaic DOWNGRADE

Affected: 1.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison mosaic sudo apt install mosaic=<VERSION_BEFORE_1.0.0> sudo apt-mark hold mosaic

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

dnf --showduplicates list mosaic sudo dnf downgrade mosaic-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add mosaic

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-2022-31521?

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

Is CVE-2022-31521 being exploited?

CVE-2022-31521 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-2022-31521 affect?

CVE-2022-31521 affects mosaic. Severity is critical (CVSS 9.3). The Niyaz-Mohamed/mosaic repository through 1.0.0 on GitHub allows absolute path traversal because the Flask send_file function is used unsafely.

How urgent is CVE-2022-31521?

Priority 60/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

GitHub vulnerabilities · Flask vulnerabilities

Related CVEs

CVE-2024-5965 MEDIUM 6.4 UPGRADE The Mosaic theme for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘link’ parameter within th

References

← Back to latest CVEs