CVE-2025-40927

UNKNOWN

Published 2025-08-29T00:10:07.161Z

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No CVSS data available

Description

Although some validation exists, it can be bypassed using URL-encoded values, allowing an attacker to inject untrusted content into the response via query parameters.

As a result, an attacker can inject a line break (e.g. %0A) into the parameter value, causing the server to split the HTTP response and inject arbitrary headers or even an HTML/JavaScript body, leading to reflected cross-site scripting (XSS), open redirect or other attacks.

The issue documented in CVE-2010-4410 https://www.cve.org/CVERecord?id=CVE-2010-4410 is related but the fix was incomplete.

Impact

By injecting %0A (newline) into a query string parameter, an attacker can:

* Break the current HTTP header
* Inject a new header or entire body
* Deliver a script payload that is reflected in the server’s response
That can lead to the following attacks:

* reflected XSS
* open redirect
* cache poisoning
* header manipulation

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

MANWAR

CGI::Simple

Affected Versions:

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed HIGH

GHSA-wh29-fq99-4ww5

Advisory Details

CGI::Simple versions before 1.282 for Perl has a HTTP response splitting flaw This vulnerability is a confirmed HTTP response splitting flaw in CGI::Simple that allows HTTP response header injection, which can be used for reflected XSS or open redirect under certain conditions. Although some validation exists, it can be bypassed using URL-encoded values, allowing an attacker to inject untrusted content into the response via query parameters. As a result, an attacker can inject a line break (e.g. %0A) into the parameter value, causing the server to split the HTTP response and inject arbitrary headers or even an HTML/JavaScript body, leading to reflected cross-site scripting (XSS), open redirect or other attacks. The issue documented in CVE-2010-4410 https://www.cve.org/CVERecord?id=CVE-2010-4410 is related but the fix was incomplete. Impact By injecting %0A (newline) into a query string parameter, an attacker can: * Break the current HTTP header * Inject a new header or entire body * Deliver a script payload that is reflected in the server’s response That can lead to the following attacks: * reflected XSS * open redirect * cache poisoning * header manipulation

CVSS Scoring

CVSS Score

7.5

CVSS Vector


                                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2025-40927

WEB https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-2320

WEB https://datatracker.ietf.org/doc/html/rfc7230#section-3

WEB https://metacpan.org/release/MANWAR/CGI-Simple-1.281/diff/MANWAR/CGI-Simple-1.282/lib/CGI/Simple.pm

WEB https://metacpan.org/release/MANWAR/CGI-Simple-1.281/source/lib/CGI/Simple.pm#L1031-1035

WEB https://owasp.org/www-community/attacks/HTTP_Response_Splitting

WEB https://rt.perl.org/Public/Bug/Display.html?id=21951

Advisory provided by GitHub Security Advisory Database. Published: August 29, 2025, Modified: August 29, 2025

Social Media Intelligence

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1 post

Reddit • 5 days, 18 hours ago

michaelpaoli

Debian 13.1 (and 12.12) 2025-09-06 "Just" a "minor" point release. But for those that have been waiting to upgrade to Debian 13, perhaps that time now draws nearer? [\[SUA 273-1\] Upcoming Debian 13 Update (13.1)](https://lists.debian.org/debian-stable-announce/2025/09/msg00000.html) [\[SUA 274-1\] Upcoming Debian 12 Update (12.12)](https://lists.debian.org/debian-stable-announce/2025/09/msg00001.html) 13.1: >\[SUA 273-1\] Upcoming Debian 13 Update (13.1) …