CVE-2021-43678: Wechat-php-sdk v1.10.2 is affected by a Cross Site Scripting (XSS) vulnerability in Wechat.php.

This month

MEDIUM 6.1DOWNGRADE

CVE-2021-43678 is a medium-severity flaw (CVSS 6.1) affecting wechat-php-sdk. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Wechat-php-sdk v1.10.2 is affected by a Cross Site Scripting (XSS) vulnerability in Wechat.php.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-12-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: wechat-php-sdk project

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

Am I affected?

Timeline

2021-12-17 13:15 UTCPublished CVE record published
2026-06-17 04:11 UTCUpdated Record last modified

wechat-php-sdk project wechat-php-sdk DOWNGRADE

Affected: 1.10.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.10.2

1. Check installed version

apt-cache policy wechat-php-sdk || rpm -q wechat-php-sdk || wechat-php-sdk --version

2. No fixed release: DOWNGRADE to a release before 1.10.2 (Debian / Ubuntu)

apt-cache madison wechat-php-sdk sudo apt install wechat-php-sdk=<VERSION_BEFORE_1.10.2> sudo apt-mark hold wechat-php-sdk

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list wechat-php-sdk sudo dnf downgrade wechat-php-sdk-<VERSION_BEFORE_1.10.2> sudo dnf versionlock add wechat-php-sdk

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2021-43678?

wechat-php-sdk: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-43678 being exploited?

CVE-2021-43678 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-2021-43678 affect?

CVE-2021-43678 affects wechat-php-sdk. Severity is medium (CVSS 6.1). Wechat-php-sdk v1.10.2 is affected by a Cross Site Scripting (XSS) vulnerability in Wechat.php.

How urgent is CVE-2021-43678?

Priority 40/100. Public exploit reference

Software pages

PHP vulnerabilities

References

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