CVE-2021-4315

NYUCCL psiTurk experiment.py special elements used in a template engine

5.5 MediumFix available

A vulnerability has been found in NYUCCL psiTurk up to 3.2.0 and classified as critical. This vulnerability affects unknown code of the file psiturk/experiment.py. The manipulation of the argument mode leads to improper neutralization of special elements used in a template engine. The exploit has been disclosed to the public and may be used. Upgrading to version 3.2.1 is able to address this issue. The name of the patch is 47787e15cecd66f2aa87687bf852ae0194a4335f. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-219676.

Attack profile

How easy it is to exploit

Attack vector: Adjacent network
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: Low

Exploit likelihood

0.92%Unchanged since Jan 29, 2023

What each source reports

CVE List Score used 5.5

NYUCCL psiTurk experiment.py special elements used in a template engine

Record: CVE-2021-4315
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
CVSS 3.0: 5.5 MediumCVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
CVSS 2.0: 5.2 AV:A/AC:L/Au:S/C:P/I:P/A:P
Weakness: CWE-1336
Updated: 2026-11-02

EUVDEUVD-2023-0210 5.5

Record: EUVD-2023-0210
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Updated: 2026-11-03

GitHub AdvisoriesGHSA-9mq4-9556-6qxq 8.7

NYUCCL psiTurk IS vulnerable to Improper Neutralization of Special Elements

Record: GHSA-9mq4-9556-6qxq
CVSS 4.0: 8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-94, CWE-1336
Updated: 2026-11-02

NVD 5.5

Record: CVE-2021-4315
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 5.2 MediumAV:A/AC:L/Au:S/C:P/I:P/A:P
Weakness: CWE-1336, CWE-94
Updated: 2026-11-02

OSV 8.8

Record: CVE-2021-4315
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVGHSA-9mq4-9556-6qxq 8.7

NYUCCL psiTurk IS vulnerable to Improper Neutralization of Special Elements

Record: GHSA-9mq4-9556-6qxq
CVSS 4.0: 8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-1336, CWE-94
Updated: 2026-11-02

OSVPYSEC-2023-43 No score

Record: PYSEC-2023-43
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`psiturk` PyPI	before 3.2.1	3.2.1
`psiturk` PyPI	before 3.2.1, plus listed versions 1.01.0.11.0.21.0.31.0a1 Show 41 moreShow less 1.0a21.0a31.0b12.02.0.02.0.12.1.02.1.12.1.22.1.2b2.1.3b02.1.42.1.62.1.72.2.02.2.12.2.22.2.32.2.42.3.02.3.12.3.102.3.112.3.122.3.22.3.32.3.42.3.52.3.62.3.72.3.82.3.93.0.03.0.13.0.23.0.33.0.43.0.53.0.63.1.03.2.0	3.2.1
`psiturk` PyPI	before 3.2.1, plus listed versions 1.01.0.11.0.21.0.31.0a1 Show 45 moreShow less 1.0a21.0a31.0b12.02.0.02.0.12.1.02.1.12.1.22.1.2b2.1.3b02.1.42.1.62.1.72.2.02.2.12.2.22.2.32.2.42.3.02.3.12.3.102.3.112.3.122.3.22.3.32.3.42.3.52.3.62.3.72.3.82.3.93.0.03.0.13.0.23.0.33.0.43.0.53.0.63.1.03.2.0v3.2.0v3.1.0v3.0.6v2.3.12-travis-1	3.2.1

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, published	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-4315 is a medium vulnerability (CVSS 5.5) in Nyuccl Psiturk, published January 28, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.92%, the 60th percentile. Fixed in psiturk 3.2.1.

References

This page doesn't list everything

Left out here: 10 versions. The JSON record has them.