CVE-2001-0857: Cross-site scripting vulnerability in status.php3 in Imp Webmail 2.2.6 and earlier allows remote attackers to

Q: How do I fix CVE-2001-0857?

webmail: upgrade to newer than 2.2.6. Exact commands for each OS are on this page.

Q: Is CVE-2001-0857 being exploited?

CVE-2001-0857 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2001-0857 affect?

CVE-2001-0857 affects webmail. Severity is high (CVSS 7.5). Cross-site scripting vulnerability in status.php3 in Imp Webmail 2.2.6 and earlier allows remote attackers to gain access to the e-mail of other users by hijacking session cookies via the message parameter.

Q: How urgent is CVE-2001-0857?

Priority 55/100. High severity; EPSS top 5%: very likely to be exploited; Public exploit reference

This month

HIGH 7.5UPGRADE

CVE-2001-0857 is a high-severity flaw (CVSS 7.5) affecting webmail. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting vulnerability in status.php3 in Imp Webmail 2.2.6 and earlier allows remote attackers to gain access to the e-mail of other users by hijacking session cookies via the message parameter.

Why this priority

High severity
EPSS top 5%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	7.9% (top 5%)
CISA exploited list	No
Published	2001-12-06
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: imp

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

Am I affected?

Timeline

2001-12-06 05:00 UTCPublished CVE record published
2026-06-16 21:55 UTCUpdated Record last modified

imp webmail UPGRADE

Affected: <= 2.2.6

Fixed in: newer than 2.2.6

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy webmail || rpm -q webmail || webmail --version

2. UPGRADE to newer than 2.2.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade webmail

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade webmail

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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: Horde IMP 2.2.x - Session Hijacking

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-2001-0857?

webmail: upgrade to newer than 2.2.6. Exact commands for each OS are on this page.

Is CVE-2001-0857 being exploited?

CVE-2001-0857 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-2001-0857 affect?

CVE-2001-0857 affects webmail. Severity is high (CVSS 7.5). Cross-site scripting vulnerability in status.php3 in Imp Webmail 2.2.6 and earlier allows remote attackers to gain access to the e-mail of other users by hijacking session cookies via the message parameter.

How urgent is CVE-2001-0857?

Priority 55/100. High severity; EPSS top 5%: very likely to be exploited; Public exploit reference

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References

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