CVE-2023-34658: Telegram v9.6.3 on iOS allows attackers to hide critical information on the User Interface via calling the fun

Routine

MEDIUM 5.3REMOTEDOWNGRADE

CVE-2023-34658 is a medium-severity flaw (CVSS 5.3) affecting telegram. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Telegram v9.6.3 on iOS allows attackers to hide critical information on the User Interface via calling the function SFSafariViewController.

Why this priority

Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 65%)
CISA exploited list	No
Weakness	CWE-1021
Published	2023-06-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: telegram

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

Am I affected?

Timeline

2023-06-29 17:15 UTCPublished CVE record published
2026-06-17 06:03 UTCUpdated Record last modified

telegram telegram DOWNGRADE

Affected: 9.6.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.6.3

1. Check installed version

apt-cache policy telegram || rpm -q telegram || telegram --version

2. No fixed release: DOWNGRADE to a release before 9.6.3 (Debian / Ubuntu)

apt-cache madison telegram sudo apt install telegram=<VERSION_BEFORE_9.6.3> sudo apt-mark hold telegram

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

dnf --showduplicates list telegram sudo dnf downgrade telegram-<VERSION_BEFORE_9.6.3> sudo dnf versionlock add telegram

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-2023-34658?

telegram: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-34658 being exploited?

CVE-2023-34658 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-2023-34658 affect?

CVE-2023-34658 affects telegram. Severity is medium (CVSS 5.3). Telegram v9.6.3 on iOS allows attackers to hide critical information on the User Interface via calling the function SFSafariViewController.

How urgent is CVE-2023-34658?

Priority 32/100. Remotely exploitable, no login, no user action

Software pages

iOS vulnerabilities · Telegram vulnerabilities

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References

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