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CVE-2026-71981

HIGH 1 PoC
MEDIUM Priority: 0.08 BB Relevance: 78/100
Published: 2026-09-01 Modified: 2026-11-08 First seen: 2026-11-08 Status: active

Attack Surface

Network Low Complexity No Interaction Conf. Impact Integ. Impact

CVSS Vector Breakdown

AV: Network
AC: Low
PR: Low
UI: None
AT: None
VC: High
VI: High
VA: High

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.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
cypht-org cypht 0 < 2.12.2

References & Advisories (4)

Proof of Concept (1)

—
https://github.com/lyn4r/CVE-2026-71981
nomi-sec

Bug Bounty Relevance

78 / 100
✓ Network accessible
✓ Low complexity
✓ No user interaction
✓ PoC available (1)

CVSS Score

8.7 / 10.0 v4.0
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

EPSS — Exploitation Probability

0.97%
Raw Score 0.009720
Percentile 62.5%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00972
2026-11-12
0.00972
2026-11-10
0.00972
2026-11-09
0.00972
2026-11-08
0.00972

Intelligence Sources

mitre ref →

External Links