CVE-2018-25047 — In Smarty before 3

In Smarty before 3.1.47 and 4.x before 4.2.1, libs/plugins/function.mailto.php allows XSS. A web page that uses smarty_function_mailto, and that could be parameterized using GET or POST input parameters, could allow injection of JavaScript code by a user.

01What is this vulnerability?

In Smarty before 3.1.47 and 4.x before 4.2.1, libs/plugins/function.mailto.php allows XSS. A web page that uses smarty_function_mailto, and that could be parameterized using GET or POST input parameters, could allow injection of JavaScript code by a user.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2022-09-14T00:00:00.000Z
• Last modified: 2025-11-03T21:44:10.223Z

09References

• github.com — https://github.com/smarty-php/smarty/issues/454
• github.com — https://github.com/smarty-php/smarty/releases/tag/v4.2.1
• github.com — https://github.com/smarty-php/smarty/releases/tag/v3.1.47
• bugs.gentoo.org — https://bugs.gentoo.org/870100
• security.gentoo.org — https://security.gentoo.org/glsa/202209-09
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2023/01/msg00002.html