CVE-2026-34745: Fireshare facilitates self-hosted media and link sharing

Q: How do I fix CVE-2026-34745?

fireshare: upgrade to 1.5.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-34745 being exploited?

CVE-2026-34745 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-34745 affect?

CVE-2026-34745 affects fireshare. Severity is critical (CVSS 9.1). Fireshare facilitates self-hosted media and link sharing. Prior to version 1.5.3, the fix for CVE-2026-33645 was applied to the authenticated /api/uploadChunked endpoint but was not applied to the unauthenticated /api/uploadChunked/public e

Q: How urgent is CVE-2026-34745?

Priority 54/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.1REMOTEUPGRADE

CVE-2026-34745 is a critical-severity flaw (CVSS 9.1) affecting fireshare. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Fireshare facilitates self-hosted media and link sharing. Prior to version 1.5.3, the fix for CVE-2026-33645 was applied to the authenticated /api/uploadChunked endpoint but was not applied to the unauthenticated /api/uploadChunked/public endpoint in the same file (app/server/fireshare/api.py). An unauthenticated attacker can exploit the checkSum parameter to write arbitrary files with attacker-controlled content to any writable path on the serve

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-04-02
Last modified	2026-07-24

Publisher (CNA): GitHub, Inc. · Vendor: shaneisrael

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-02 19:21 UTCPublished CVE record published
2026-07-24 21:10 UTCUpdated Record last modified

shaneisrael fireshare UPGRADE

Affected: < 1.5.3

Fixed in: 1.5.3

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.5.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade fireshare

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fireshare

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2026-34745?

fireshare: upgrade to 1.5.3. Exact commands for each OS are on this page.

Is CVE-2026-34745 being exploited?

CVE-2026-34745 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-2026-34745 affect?

CVE-2026-34745 affects fireshare. Severity is critical (CVSS 9.1). Fireshare facilitates self-hosted media and link sharing. Prior to version 1.5.3, the fix for CVE-2026-33645 was applied to the authenticated /api/uploadChunked endpoint but was not applied to the unauthenticated /api/uploadChunked/public e

How urgent is CVE-2026-34745?

Priority 54/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-33645 HIGH 7.1 DOWNGRADE Fireshare facilitates self-hosted media and link sharing

References

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