Medium severity4.3NVD Advisory· Published May 27, 2025· Updated Apr 13, 2026
CVE-2025-5266
CVE-2025-5266
Description
Script elements loading cross-origin resources generated load and error events which leaked information enabling XS-Leaks attacks. This vulnerability was fixed in Firefox 139, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
40cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*+ 3 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*range: <139.0
- cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*range: <128.11.0
- (no CPE)range: <128.11
- (no CPE)range: <139
- Range: <139, <128.11
- osv-coords35 versionspkg:apk/chainguard/firefoxpkg:apk/chainguard/firefox-esrpkg:apk/wolfi/firefoxpkg:rpm/almalinux/firefoxpkg:rpm/almalinux/firefox-x11pkg:rpm/almalinux/thunderbirdpkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/mozjs128&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/mozjs128&distro=openSUSE%20Tumbleweedpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Enterprise%20Storage%207.1pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP3-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-ESPOSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP6pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP7pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP3-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP5-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP3pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP4pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP5pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP6pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP7pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP6pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP7pkg:rpm/suse/mozjs128&distro=SUSE%20Linux%20Enterprise%20Server%2016.0pkg:rpm/suse/mozjs128&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0
< 128.11-r0+ 34 more
- (no CPE)range: < 128.11-r0
- (no CPE)range: < 128.11-r0
- (no CPE)range: < 128.11-r0
- (no CPE)range: < 128.11.0-1.el9_6.alma.1
- (no CPE)range: < 128.11.0-1.el9_6.alma.1
- (no CPE)range: < 128.11.0-1.el9_6.alma.1
- (no CPE)range: < 128.11.0-1.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 139.0.1-1.1
- (no CPE)range: < 128.11.0-150200.8.221.1
- (no CPE)range: < 128.11.0-1.1
- (no CPE)range: < 128.14.0-160000.1.1
- (no CPE)range: < 128.12.0-1.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-112.262.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-112.262.1
- (no CPE)range: < 128.11.0-150200.8.221.1
- (no CPE)range: < 128.11.0-150200.8.221.1
- (no CPE)range: < 128.11.0-150200.8.221.1
- (no CPE)range: < 128.11.0-150200.8.221.1
- (no CPE)range: < 128.14.0-160000.1.1
- (no CPE)range: < 128.14.0-160000.1.1
Patches
Vulnerability mechanics
References
7- www.mozilla.org/security/advisories/mfsa2025-42/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2025-44/nvdVendor Advisory
- bugzilla.mozilla.org/show_bug.cginvdPermissions Required
- lists.debian.org/debian-lts-announce/2025/05/msg00043.htmlnvd
- lists.debian.org/debian-lts-announce/2025/05/msg00046.htmlnvd
- www.mozilla.org/security/advisories/mfsa2025-45/nvd
- www.mozilla.org/security/advisories/mfsa2025-46/nvd
News mentions
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