CVE-2021-32792Network attack vector

Cross-site scripting via unescaped single-quote URLs

Published Jul 26, 2021 · Updated Aug 3, 2024

Cross-site scripting in OpenIDC mod_auth_openidc before 2.4.9 allows remote attackers to run script in a user's browser via a crafted URL. With OIDCPreservePost On, the POST-preservation response embeds a single-quote-bearing URL in generated client-side content without safely escaping the quote. Exploitation requires that configuration and victim interaction with the crafted URL; injected script executes in the protected site's browser origin.

CVSS severity6.1
Medium
EPSS probability1.52%
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

Cross-site scripting in OpenIDC mod_auth_openidc before 2.4.9 allows remote attackers to run script in a user's browser via a crafted URL. With OIDCPreservePost On, the POST-preservation response embeds a single-quote-bearing URL in generated client-side content without safely escaping the quote. Exploitation requires that configuration and victim interaction with the crafted URL; injected script executes in the protected site's browser origin.

The record

CVE
CVE-2021-32792
Published
Jul 26, 2021
Updated
Aug 3, 2024
Vendor
OpenIDC
Product
mod_auth_openidc
Classifications
CWE-79, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 26, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record 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=< 2.4.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenIDC · mod_auth_openidcversion=< 2.4.9

Published CVSS scores

6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
3.1GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1190Exploit Public-Facing Application

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