CVE-2007-0681: profile.php in ExtCalendar 2 and earlier allows remote attackers to change the passwords of arbitrary users wi

Q: How do I fix CVE-2007-0681?

extcalendar: upgrade to newer than 2. Exact commands for each OS are on this page.

Q: Is CVE-2007-0681 being exploited?

CVE-2007-0681 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-2007-0681 affect?

CVE-2007-0681 affects extcalendar. Severity is critical (CVSS 9.8). profile.php in ExtCalendar 2 and earlier allows remote attackers to change the passwords of arbitrary users without providing the original password, and possibly perform other unauthorized actions, via modified values to register.php.

Q: How urgent is CVE-2007-0681?

Priority 67/100. Critical severity; EPSS top 7%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2007-0681 is a critical-severity flaw (CVSS 9.8) affecting extcalendar. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

profile.php in ExtCalendar 2 and earlier allows remote attackers to change the passwords of arbitrary users without providing the original password, and possibly perform other unauthorized actions, via modified values to register.php.

Why this priority

Critical severity
EPSS top 7%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	5.4% (top 7%)
CISA exploited list	No
Weakness	CWE-522
Published	2007-02-03
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: extcalendar project

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

Am I affected?

Timeline

2007-02-03 01:28 UTCPublished CVE record published
2026-06-16 22:36 UTCUpdated Record last modified

extcalendar project extcalendar UPGRADE

Affected: <= 2

Fixed in: newer than 2

Safe to downgrade to: no unaffected older release

1. Check installed version

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

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

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade extcalendar

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: Extcalendar 2 - 'profile.php' Remote User Pass Change

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-2007-0681?

extcalendar: upgrade to newer than 2. Exact commands for each OS are on this page.

Is CVE-2007-0681 being exploited?

CVE-2007-0681 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-2007-0681 affect?

CVE-2007-0681 affects extcalendar. Severity is critical (CVSS 9.8). profile.php in ExtCalendar 2 and earlier allows remote attackers to change the passwords of arbitrary users without providing the original password, and possibly perform other unauthorized actions, via modified values to register.php.

How urgent is CVE-2007-0681?

Priority 67/100. Critical severity; EPSS top 7%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

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References

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