Code injection in topthink/think

published 2021-07-26 5y ago modified 2026-06-17 4mo ago also GHSA-ch3r-vp46-8g22 , EUVD-2021-1681

cvss: 9.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.5%; EPSS 2.5% chance of exploitation in 30 days, percentile 84%
public exploits: 0; none known

A remote code execution (RCE) vulnerability in /library/think/App.php of Twothink v2.0 allows attackers to execute arbitrary PHP code.

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Exploit prediction

2.47% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

github.com https://github.com/twothink/twothink/issues/1 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
packagist	topthink/think	<=6.0.9	no fix listed

Classification

Weakness

CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component

References

github.com /twothink/twothink/issues/1
web, exploit, issue-tracking, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2020-17952
advisory
github.com /twothink/twothink
package

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.