How severe is CVE-2026-34745?

CVE-2026-34745 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2026-34745 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34745?

CVE-2026-34745 affects Shaneisrael Fireshare. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34745?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-34745 have an EU (EUVD) identifier?

Yes. CVE-2026-34745 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18507.

When was CVE-2026-34745 published?

CVE-2026-34745 was published on 2026-04-02 and last updated on 2026-06-17.

CVE-2026-34745

CVE-2026-34745 is a critical-severity vulnerability in Shaneisrael Fireshare with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18507
Weakness: CWE-22
Affected product: Shaneisrael Fireshare
Published: 2026-04-02
Last modified: 2026-06-17

Description

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 server filesystem. This issue has been patched in version 1.5.3.

Frequently asked questions

What is CVE-2026-34745?: 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 server filesystem. This issue has been patched in version 1.5.3.
How severe is CVE-2026-34745?: CVE-2026-34745 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2026-34745 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34745?: CVE-2026-34745 affects Shaneisrael Fireshare. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34745?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-34745 have an EU (EUVD) identifier?: Yes. CVE-2026-34745 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18507.
When was CVE-2026-34745 published?: CVE-2026-34745 was published on 2026-04-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:shaneisrael:fireshare:*:*:*:*:*:*:*:*

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