CVE-2025-63709: A Cross-Site Scripting (XSS) vulnerability exists in SourceCodester Simple To-Do List System 1.0 in the "Add T

Routine

MEDIUM 5.4DOWNGRADE

CVE-2025-63709 is a medium-severity flaw (CVSS 5.4) affecting simple to-do list system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Cross-Site Scripting (XSS) vulnerability exists in SourceCodester Simple To-Do List System 1.0 in the "Add Tasks" text input. An authenticated user can submit HTML/JavaScript that is not correctly sanitized or encoded on output. The injected script is stored and later rendered in the browser of any user who views the task, allowing execution of arbitrary script in the context of the victim's browser.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.3% (top 83%)
CISA exploited list	No
Weakness	CWE-79
Published	2025-11-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: chuck24

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

Am I affected?

Timeline

2025-11-10 15:15 UTCPublished CVE record published
2026-06-17 09:53 UTCUpdated Record last modified

chuck24 simple to-do list system DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy simple-to-do-list-system || rpm -q simple-to-do-list-system || simple-to-do-list-system --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison simple-to-do-list-system sudo apt install simple-to-do-list-system=<VERSION_BEFORE_1.0> sudo apt-mark hold simple-to-do-list-system

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

dnf --showduplicates list simple-to-do-list-system sudo dnf downgrade simple-to-do-list-system-<VERSION_BEFORE_1.0> sudo dnf versionlock add simple-to-do-list-system

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-2025-63709?

simple to-do list system: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-63709 being exploited?

CVE-2025-63709 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-2025-63709 affect?

CVE-2025-63709 affects simple to-do list system. Severity is medium (CVSS 5.4). A Cross-Site Scripting (XSS) vulnerability exists in SourceCodester Simple To-Do List System 1.0 in the "Add Tasks" text input. An authenticated user can submit HTML/JavaScript that is not correctly sanitized or encoded on output. The injec

How urgent is CVE-2025-63709?

Priority 28/100. Public exploit reference

Related CVEs

CVE-2025-10117 LOW 3.5 DOWNGRADE A weakness has been identified in SourceCodester Simple To-Do List System 1.0
CVE-2025-4248 MEDIUM 6.3 DOWNGRADE A vulnerability has been found in SourceCodester Simple To-Do List System 1.0 and classified as critical
CVE-2025-4247 MEDIUM 6.3 DOWNGRADE A vulnerability, which was classified as critical, was found in SourceCodester Simple To-Do List System 1.0

References

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