CVE-2006-0182: login.php in ACal Calendar Project 2.2.5 allows remote attackers to bypass authentication by setting the ACalA

This month

HIGH 7.5DOWNGRADE

CVE-2006-0182 is a high-severity flaw (CVSS 7.5) affecting calendar project. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

login.php in ACal Calendar Project 2.2.5 allows remote attackers to bypass authentication by setting the ACalAuthenticate cookie variable to "inside".

Why this priority

High severity

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	1.9% (top 20%)
CISA exploited list	No
Published	2006-01-12
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: acal

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

Am I affected?

Timeline

2006-01-12 06:02 UTCPublished CVE record published
2026-06-16 22:20 UTCUpdated Record last modified

acal calendar project DOWNGRADE

Affected: 2.2.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.2.5

1. Check installed version

apt-cache policy calendar-project || rpm -q calendar-project || calendar-project --version

2. No fixed release: DOWNGRADE to a release before 2.2.5 (Debian / Ubuntu)

apt-cache madison calendar-project sudo apt install calendar-project=<VERSION_BEFORE_2.2.5> sudo apt-mark hold calendar-project

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

dnf --showduplicates list calendar-project sudo dnf downgrade calendar-project-<VERSION_BEFORE_2.2.5> sudo dnf versionlock add calendar-project

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.

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-2006-0182?

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

Is CVE-2006-0182 being exploited?

CVE-2006-0182 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-2006-0182 affect?

CVE-2006-0182 affects calendar project. Severity is high (CVSS 7.5). login.php in ACal Calendar Project 2.2.5 allows remote attackers to bypass authentication by setting the ACalAuthenticate cookie variable to "inside".

How urgent is CVE-2006-0182?

Priority 46/100. High severity

Software pages

PHP vulnerabilities

Related CVEs

CVE-2006-0183 MEDIUM 6.5 DOWNGRADE Direct static code injection vulnerability in edit.php in ACal Calendar Project 2.2.5 allows authenticated use

References

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