CVE-2016-10073: The from method in library/core/class.email.php in Vanilla Forums before 2.3.1 allows remote attackers to spoo

Q: How do I fix CVE-2016-10073?

vanilla: upgrade to newer than 2.3.0. Exact commands for each OS are on this page.

Q: Is CVE-2016-10073 being exploited?

CVE-2016-10073 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-2016-10073 affect?

CVE-2016-10073 affects vanilla. Severity is high (CVSS 7.5). The from method in library/core/class.email.php in Vanilla Forums before 2.3.1 allows remote attackers to spoof the email domain in sent messages and potentially obtain sensitive information via a crafted HTTP Host header, as demonstrated b

Q: How urgent is CVE-2016-10073?

Priority 61/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2016-10073 is a high-severity flaw (CVSS 7.5) affecting vanilla. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The from method in library/core/class.email.php in Vanilla Forums before 2.3.1 allows remote attackers to spoof the email domain in sent messages and potentially obtain sensitive information via a crafted HTTP Host header, as demonstrated by a password reset request.

Why this priority

High severity
EPSS top 1%: 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	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	83.6% (top 1%)
CISA exploited list	No
Weakness	CWE-200
Published	2017-05-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: vanillaforums

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

Am I affected?

Timeline

2017-05-23 04:29 UTCPublished CVE record published
2026-06-17 00:39 UTCUpdated Record last modified

vanillaforums vanilla UPGRADE

Affected: <= 2.3.0

Fixed in: newer than 2.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2.3.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade vanilla

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: Vanilla Forums < 2.3 - Remote Code Execution
Metasploit: HTTP Host Header Injection Detection

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-2016-10073?

vanilla: upgrade to newer than 2.3.0. Exact commands for each OS are on this page.

Is CVE-2016-10073 being exploited?

CVE-2016-10073 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-2016-10073 affect?

CVE-2016-10073 affects vanilla. Severity is high (CVSS 7.5). The from method in library/core/class.email.php in Vanilla Forums before 2.3.1 allows remote attackers to spoof the email domain in sent messages and potentially obtain sensitive information via a crafted HTTP Host header, as demonstrated b

How urgent is CVE-2016-10073?

Priority 61/100. High severity; EPSS top 1%: 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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