🛡️ CVE-2024-1555 on Ubuntu — firefox

Distribution advisory

This page covers CVE-2024-1555 as tracked by Ubuntu, for the package firefox. The fix is available in version 123.0+build3-0ubuntu0.20.04.1; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability low.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L

• Attack vector: Network — reachable from anywhere that can route to the service.
• Attack complexity: Low — the attack works reliably, with no preparation.
• Privileges required: None — an unauthenticated stranger can try it.
• User interaction: Required — someone has to click, open or visit something.
• Scope: Unchanged — the damage stays inside the vulnerable component.
• Confidentiality impact: High — total loss, or loss the attacker controls.
• Integrity impact: High — total loss, or loss the attacker controls.
• Availability impact: Low — limited, and the attacker does not choose what is affected.

Weakness class

UBUNTU-CVE-2024-1555 is classified as CWE-290: Authentication Bypass by Spoofing. Identity is inferred from something an attacker can forge, such as a header or address.

Affected software

UBUNTU-CVE-2024-1555 is recorded against 7 packages.

• firefox (fixed in 123.0+build3-0ubuntu0.20.04.1)
• mozjs102
• mozjs38
• mozjs52
• mozjs68
• mozjs78
• mozjs91

Timeline and source

Published on 20 February 2024 and last revised on 22 April 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
www.mozilla.org (Report)
bugzilla.mozilla.org (Report)
www.mozilla.org (Report)
ubuntu.com (Advisory)
www.cve.org (Report)

Other advisories for this package

firefox has other advisories on record. If you are patching this one, these are worth checking on the same host:

• MGASA-2026-0325 (published 7 Aug 2026)
• CGA-39pg-834q-786j (published 30 Jul 2026)
• CGA-m9h4-w59h-mvqr (published 30 Jul 2026)
• CGA-vg32-5q2f-7vc3 (published 30 Jul 2026)

Same weakness in other software

These advisories are the same class of weakness (CWE-290: Authentication Bypass by Spoofing) in other software:

• CVE-2026-14450 (9.9 Critical, published 10 Aug 2026)
• CVE-2026-65502 (5.3 Medium, published 6 Aug 2026)
• CVE-2026-32469 (5.3 Medium, published 6 Aug 2026)
• CVE-2026-65570 (8.1 High, published 6 Aug 2026)
• CVE-2026-48063 (9.5 Critical, published 3 Aug 2026)
• CVE-2026-14840 (5.3 Medium, published 1 Aug 2026)
• CVE-2026-13143 (5.3 Medium, published 30 Jul 2026)
• CVE-2026-28812 (9.8 Critical, published 30 Jul 2026)

CVE-2024-1555 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Affected Packages

References