CVE-2011-4273: Multiple cross-site scripting (XSS) vulnerabilities in GoAhead Webserver 2.18 allow remote attackers to inject

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MEDIUM 4.3DOWNGRADE

CVE-2011-4273 is a medium-severity flaw (CVSS 4.3) affecting goahead webserver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple cross-site scripting (XSS) vulnerabilities in GoAhead Webserver 2.18 allow remote attackers to inject arbitrary web script or HTML via (1) the group parameter to goform/AddGroup, related to addgroup.asp; (2) the url parameter to goform/AddAccessLimit, related to addlimit.asp; or the (3) user (aka User ID) or (4) group parameter to goform/AddUser, related to adduser.asp.

Why this priority

EPSS top 8%: very likely to be exploited
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	4.8% (top 8%)
CISA exploited list	No
Weakness	CWE-79
Published	2011-11-03
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: goahead

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2011-11-03 10:55 UTCPublished CVE record published
2026-06-16 23:34 UTCUpdated Record last modified

goahead goahead webserver DOWNGRADE

Affected: 2.1.8

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.1.8

1. Check installed version

apt-cache policy goahead-webserver || rpm -q goahead-webserver || goahead-webserver --version

2. No fixed release: DOWNGRADE to a release before 2.1.8 (Debian / Ubuntu)

apt-cache madison goahead-webserver sudo apt install goahead-webserver=<VERSION_BEFORE_2.1.8> sudo apt-mark hold goahead-webserver

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list goahead-webserver sudo dnf downgrade goahead-webserver-<VERSION_BEFORE_2.1.8> sudo dnf versionlock add goahead-webserver

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: GoAhead Web Server 2.18 - 'addgroup.asp?group' Cross-Site Scripting
Exploit-DB: GoAhead Web Server 2.18 - 'addlimit.asp?url' Cross-Site Scripting
Exploit-DB: GoAhead Web Server 2.18 - 'adduser.asp' Multiple Cross-Site Scripting Vulnerabilities

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2011-4273?

goahead webserver: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2011-4273 being exploited?

CVE-2011-4273 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2011-4273 affect?

CVE-2011-4273 affects goahead webserver. Severity is medium (CVSS 4.3). Multiple cross-site scripting (XSS) vulnerabilities in GoAhead Webserver 2.18 allow remote attackers to inject arbitrary web script or HTML via (1) the group parameter to goform/AddGroup, related to addgroup.asp; (2) the url parameter to go

How urgent is CVE-2011-4273?

Priority 43/100. EPSS top 8%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2009-5111 MEDIUM 5.0 MITIGATE GoAhead WebServer allows remote attackers to cause a denial of service (daemon outage) via partial HTTP reques
CVE-2007-6702 MEDIUM 5.0 MITIGATE MITIGATE goform/QuickStart_c0 on the GoAhead Web Server on the FS4104-AW (aka rooter) VDSL device contains a password i
CVE-2003-1569 MEDIUM 5.0 UPGRADE GoAhead WebServer before 2.1.5 on Windows 95, 98, and ME allows remote attackers to cause a denial of service
CVE-2003-1568 MEDIUM 5.0 DOWNGRADE UPGRADE GoAhead WebServer before 2.1.6 allows remote attackers to cause a denial of service (NULL pointer dereference
CVE-2002-2431 HIGH 7.5 UPGRADE Unspecified vulnerability in GoAhead WebServer before 2.1.4 allows remote attackers to cause "incorrect behavi

References

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