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CVE

CVE-2026-76834

b2evolution CMS 6.7.8 through 7.2.5 Object Injection via Negative Integer Array Key
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CVE

CVE-2026-76834

b2evolution CMS 6.7.8 through 7.2.5 Object Injection via Negative Integer Array Key

b2evolution CMS versions 6.7.8 through 7.2.5 contain an incomplete fix for CVE-2016-8901 where the serialized-array object check in paramcheckserializedarray() fails to reject payloads with negative integer array keys. Unauthenticated attackers can submit crafted serialized PHP objects via POST requests to htsrv/callplugin.php that bypass validation and reach unserialize(), instantiating arbitrary PHP objects with attacker-chosen properties that may enable code execution if suitable POP gadget chains exist.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.2
-
4.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://b2evolution.net/news/2022/03/26/2022-update-eol, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76834.json, https://nvd.nist.gov/vuln/detail/CVE-2026-76834, https://www.vulncheck.com/advisories/b2evolution-cms-6.7.8-through-7.2.5-object-injection-via-negative-integer-array-key, https://github.com/b2evolution/b2evolution/commit/25c21cf9cc4261324001f9039509710b37ee2c4d, https://github.com/b2evolution/b2evolution/commit/335abf09bcea61717bd00bc1e3889f8100ebd1bb, https://github.com/b2evolution/b2evolution/commit/999b5ad1d59760d7e450ceb541f55432fc74cd27, https://github.com/b2evolution/b2evolution, https://gist.github.com/axg11/3e29501c33f6e1e05ac2a00107afd64e, https://github.com/b2evolution/b2evolution/blob/7.2.5/htsrv/callplugin.php#L49, https://github.com/b2evolution/b2evolution/blob/7.2.5/inc/core/_param.funcs.php#L2860

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.00847%
EPSS Percentile
0.57164%
Introduced Version
baf4c9d1245b0149dca900b50e812b059c011b31
Fix Available
999b5ad1d59760d7e450ceb541f55432fc74cd27

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