CVE-2021-36891Network attack vector

Plugin settings changes via cross-site requests

Published Jun 15, 2022 · Updated Apr 28, 2026

CSRF in Supsystic Photo Gallery 1.15.5 and earlier allows remote attackers to change plugin settings through a crafted request. The public CNA record and upstream changelog do not identify the affected handler or explain which request-token validation is missing. Exploitation requires an authenticated administrator to interact with attacker-controlled content, and the bounded consequence is unauthorized modification of gallery configuration.

CVSS severity5.4
Medium
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

CSRF in Supsystic Photo Gallery 1.15.5 and earlier allows remote attackers to change plugin settings through a crafted request. The public CNA record and upstream changelog do not identify the affected handler or explain which request-token validation is missing. Exploitation requires an authenticated administrator to interact with attacker-controlled content, and the bounded consequence is unauthorized modification of gallery configuration.

The record

CVE
CVE-2021-36891
Published
Jun 15, 2022
Updated
Apr 28, 2026
Vendor
Supsystic
Product
Photo Gallery by Supsystic
Classifications
CWE-352
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 15, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 1.15.5 <=1.15.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Supsystic · Photo Gallery by Supsysticversion=<= 1.15.5 <=1.15.5

Published CVSS scores

4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
5.4PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo