CVE-2013-4701: Auth/Yadis/XML.php in PHP OpenID Library 2.2.2 and earlier allows remote attackers to read arbitrary files, se

Q: How do I fix CVE-2013-4701?

php-openid: upgrade to newer than 2.2.2. Exact commands for each OS are on this page.

Q: Is CVE-2013-4701 being exploited?

CVE-2013-4701 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-2013-4701 affect?

CVE-2013-4701 affects php-openid. Severity is high (CVSS 7.5). Auth/Yadis/XML.php in PHP OpenID Library 2.2.2 and earlier allows remote attackers to read arbitrary files, send HTTP requests to intranet servers, or cause a denial of service (CPU and memory consumption) via XRDS data containing an extern

Q: How urgent is CVE-2013-4701?

Priority 53/100. High severity; Public exploit reference

This month

HIGH 7.5UPGRADE

CVE-2013-4701 is a high-severity flaw (CVSS 7.5) affecting php-openid. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Auth/Yadis/XML.php in PHP OpenID Library 2.2.2 and earlier allows remote attackers to read arbitrary files, send HTTP requests to intranet servers, or cause a denial of service (CPU and memory consumption) via XRDS data containing an external entity declaration in conjunction with an entity reference, related to an XML External Entity (XXE) issue.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	3.0% (top 13%)
CISA exploited list	No
Published	2013-08-21
Last modified	2026-06-16

Publisher (CNA): JPCERT/CC · Vendor: janrain

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

Am I affected?

Timeline

2013-08-21 16:55 UTCPublished CVE record published
2026-06-16 23:57 UTCUpdated Record last modified

janrain php-openid UPGRADE

Affected: <= 2.2.2

Fixed in: newer than 2.2.2

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2.2.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade php-openid

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-2013-4701?

php-openid: upgrade to newer than 2.2.2. Exact commands for each OS are on this page.

Is CVE-2013-4701 being exploited?

CVE-2013-4701 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-2013-4701 affect?

CVE-2013-4701 affects php-openid. Severity is high (CVSS 7.5). Auth/Yadis/XML.php in PHP OpenID Library 2.2.2 and earlier allows remote attackers to read arbitrary files, send HTTP requests to intranet servers, or cause a denial of service (CPU and memory consumption) via XRDS data containing an extern

How urgent is CVE-2013-4701?

Priority 53/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2016-2049 HIGH 8.8 MITIGATE examples/consumer/common.php in JanRain PHP OpenID library (aka php-openid) improperly checks the openid.realm
CVE-2011-3707 MEDIUM 5.0 DOWNGRADE JanRain PHP OpenID library (aka php-openid) 2.2.2 allows remote attackers to obtain sensitive information via

References

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