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Vulnerability record · CVE-2010-3870 · published 12 November 2010

CVE-2010-3870: Php improper input validation vulnerability

Php · Php

The utf8_decode function in PHP before 5.3.4 does not properly handle non-shortest form UTF-8 encoding and ill-formed subsequences in UTF-8 data, which makes it easier for remote attackers to bypass cross-site scripting (XSS) and SQL injection protection mechanisms via a crafted string.

6.8 CVSS 2.0 Medium EPSS 11% · top 4.2% CWE-20 · Improper input validation
6.8CVSS 2.0 base score
11%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
66References, 12 tagged exploit
16 Jun 2026Last modified by NVD

Description

The utf8_decode function in PHP before 5.3.4 does not properly handle non-shortest form UTF-8 encoding and ill-formed subsequences in UTF-8 data, which makes it easier for remote attackers to bypass cross-site scripting (XSS) and SQL injection protection mechanisms via a crafted string.

AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://bugs.php.net/bug.php?id=48230 ExploitVendor Advisory
http://bugs.php.net/bug.php?id=49687 ExploitVendor Advisory
http://lists.apple.com/archives/security-announce/2011/Mar/msg00006.html Mailing ListThird Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2011-January/052836.html Mailing ListThird Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2011-January/052845.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2010-12/msg00000.html Mailing ListThird Party Advisory
http://marc.info/?l=bugtraq&m=133469208622507&w=2 Mailing ListThird Party Advisory
http://secunia.com/advisories/42410 Third Party Advisory
http://secunia.com/advisories/42812 Third Party Advisory
http://sirdarckcat.blogspot.com/2009/10/couple-of-unicode-issues-on-php-and.html ExploitThird Party Advisory
http://support.apple.com/kb/HT4581 Third Party Advisory
http://svn.php.net/viewvc?view=revision&revision=304959 PatchVendor Advisory
http://us2.php.net/manual/en/function.utf8-decode.php#83935 ExploitVendor Advisory
http://www.acunetix.com/blog/web-security-articles/security-risks-associated-with-utf8_decode/ ExploitThird Party Advisory
http://www.blackhat.com/presentations/bh-usa-09/VELANAVA/BHUSA09-VelaNava-FavoriteXSS-SLIDES.pdf ExploitThird Party Advisory
http://www.mandriva.com/en/security/advisories?name=MDVSA-2010:224 Third Party Advisory
http://www.openwall.com/lists/oss-security/2010/11/02/1 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2010/11/02/11 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2010/11/02/2 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2010/11/02/4 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2010/11/02/6 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2010/11/02/8 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2010/11/03/1 Mailing ListThird Party Advisory
http://www.php.net/ChangeLog-5.php Vendor Advisory
http://www.redhat.com/support/errata/RHSA-2010-0919.html Third Party Advisory
http://www.redhat.com/support/errata/RHSA-2011-0195.html Third Party Advisory
http://www.securityfocus.com/bid/44605 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id?1024797 Third Party AdvisoryVDB Entry
http://www.ubuntu.com/usn/USN-1042-1 Third Party Advisory
http://www.vupen.com/english/advisories/2010/3081 Third Party Advisory
http://www.vupen.com/english/advisories/2011/0020 Third Party Advisory
http://www.vupen.com/english/advisories/2011/0021 Third Party Advisory
http://www.vupen.com/english/advisories/2011/0077 Third Party Advisory
http://bugs.php.net/bug.php?id=48230 ExploitVendor Advisory
http://bugs.php.net/bug.php?id=49687 ExploitVendor Advisory
http://lists.apple.com/archives/security-announce/2011/Mar/msg00006.html Mailing ListThird Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2011-January/052836.html Mailing ListThird Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2011-January/052845.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2010-12/msg00000.html Mailing ListThird Party Advisory
http://marc.info/?l=bugtraq&m=133469208622507&w=2 Mailing ListThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2010-3870), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.