Cypht < 2.12.2 PHP Object Injection RCE via back_query Parameter
Published Sep 1, 2026
8.7
HIGHCVSS 4.0
EPSS 0.97%
Description
Cypht before 2.12.2 contains a PHP object injection vulnerability that allows authenticated attackers to execute arbitrary operating system commands by supplying a crafted PHP object graph in the back_query GET parameter of the logout handler. Attackers can pass a base64-encoded serialized payload through this parameter, which is decoded and passed directly to unserialize() without an allow-list, signature check, or type restriction, enabling gadget-chain exploitation to achieve remote code execution as the web server process.
Affected products
-
- Version 0StatusaffectedConstraints<2.12.2
- Version
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
1 other source (NVD) ▾
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed Sep 2, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
Sep–Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 0.97% (0.00972) | 60.64th | v5 (v2026.06.15) |
| Sep 2, 2026 | 0.56% (0.00565) | 44.72th | v5 (v2026.06.15) |
References (4)
- https://github.com/cypht-org/cypht/commit/e4aa2f34e33f9328e8c93514cc3966fc3d99925e patch
- https://github.com/cypht-org/cypht/pull/2073 issue-tracking
- https://github.com/cypht-org/cypht/releases/tag/v2.12.2 release-notes
- https://www.vulncheck.com/advisories/cypht-php-object-injection-rce-via-back-query-parameter third-party-advisory
| Link | Providers | Tags |
|---|---|---|
| https://github.com/cypht-org/cypht/commit/e4aa2f34e33f9328e8c93514cc3966fc3d99925e | patch | |
| https://github.com/cypht-org/cypht/pull/2073 | issue-tracking | |
| https://github.com/cypht-org/cypht/releases/tag/v2.12.2 | release-notes | |
| https://www.vulncheck.com/advisories/cypht-php-object-injection-rce-via-back-query-parameter | third-party-advisory |
Change history (0)
No recorded changes yet.