CVE-2022-4455: A vulnerability was identified in sproctor php-calendar up to 2.0.13

Q: How do I fix CVE-2022-4455?

php-calendar: upgrade to 2022-04-28. Exact commands for each OS are on this page.

Q: Is CVE-2022-4455 being exploited?

CVE-2022-4455 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-2022-4455 affect?

CVE-2022-4455 affects php-calendar. Severity is low (CVSS 3.5). A vulnerability was identified in sproctor php-calendar up to 2.0.13. This impacts an unknown function of the file index.php. Such manipulation of the argument $_SERVER['PHP_SELF'] leads to cross site scripting. The attack may be launched r

Q: How urgent is CVE-2022-4455?

Priority 25/100. No elevated risk signals yet.

Routine

LOW 3.5UPGRADE

CVE-2022-4455 is a low-severity flaw (CVSS 3.5) affecting php-calendar. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability was identified in sproctor php-calendar up to 2.0.13. This impacts an unknown function of the file index.php. Such manipulation of the argument $_SERVER['PHP_SELF'] leads to cross site scripting. The attack may be launched remotely. The name of the patch is a2941109b42201c19733127ced763e270a357809. It is advisable to implement a patch to correct this issue.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	3.5 (Low)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-79, CWE-94
Published	2022-12-13
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: php-calendar

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-12-13 18:15 UTCPublished CVE record published
2026-06-17 05:20 UTCUpdated Record last modified

php-calendar php-calendar UPGRADE

Affected: < 2022-04-28

Fixed in: 2022-04-28

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2022-04-28 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade php-calendar

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade php-calendar

Note

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

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-2022-4455?

php-calendar: upgrade to 2022-04-28. Exact commands for each OS are on this page.

Is CVE-2022-4455 being exploited?

CVE-2022-4455 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-2022-4455 affect?

CVE-2022-4455 affects php-calendar. Severity is low (CVSS 3.5). A vulnerability was identified in sproctor php-calendar up to 2.0.13. This impacts an unknown function of the file index.php. Such manipulation of the argument $_SERVER['PHP_SELF'] leads to cross site scripting. The attack may be launched r

How urgent is CVE-2022-4455?

Priority 25/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities

References

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