CVE-2026-12304
Description
Same-origin policy bypass in Firefox's Networking: Cookies component allows cross-origin cookie access; fixed in Firefox 152 and Firefox ESR 140.12.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Same-origin policy bypass in Firefox's Networking: Cookies component allows cross-origin cookie access; fixed in Firefox 152 and Firefox ESR 140.12.
Vulnerability
A same-origin policy bypass exists in the Networking: Cookies component of Firefox. The vulnerability allows an attacker to bypass the same-origin policy, potentially enabling cross-origin cookie access. Affected versions include all prior to Firefox 152 and Firefox ESR 140.12. [1][2]
Exploitation
The specific exploitation mechanism is not disclosed in the available references. However, a same-origin policy bypass in cookies typically requires an attacker to be able to execute arbitrary script in a context that can manipulate cookies. No further details are provided.
Impact
Successful exploitation of this vulnerability could allow an attacker to bypass the same-origin policy, potentially leading to unauthorized access to cookies from other origins. This could result in information disclosure or session hijacking. The impact is rated as high. [1][2]
Mitigation
The vulnerability is fixed in Firefox 152 [1] and Firefox ESR 140.12 [2], released on June 16, 2026. Users should update to these versions or later. No workarounds are available.
AI Insight generated on Jun 16, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.
Affected products
2- Range: <152
- Range: <152
Patches
0No patches discovered yet.
Vulnerability mechanics
No source-code context for this CVE — mechanics is only generated when we can read the actual fix diff. Without that, the four sections (root cause, attack vector, affected code, fix) would be speculation rather than analysis.
References
5News mentions
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